Unverified85% confidenceDecision RuleTime unknown
喇叭口径直接决定音量与低频，日常听广播选喇叭≥3英寸(约77mm)机型音量足够；便携掌上机喇叭多为1.5-2英寸，音量小仅适合近距离贴身收听
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85%
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Long-term
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